/* =============================================
   每日吃瓜大赛 · 设计系统
   概念：瓜田多巴胺 — 温暖圆润的波普语言
   ============================================= */

:root {
  --bg: #FFF9F2;
  --bg-alt: #F2FDF8;
  --primary: #FF6B4A;
  --primary-light: #FF8E53;
  --accent: #20C4A8;
  --accent-light: #E9FBF6;
  --tertiary: #FFC53D;
  --ink: #3A2E39;
  --muted: rgba(58, 46, 57, 0.62);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 12px;
  --shadow-sm: 0 4px 16px rgba(58, 46, 57, 0.04);
  --shadow-md: 0 10px 32px rgba(58, 46, 57, 0.07);
  --shadow-brand: 0 12px 40px rgba(255, 107, 74, 0.22);
  --transition: all 0.35s cubic-bezier(0.21, 1.02, 0.73, 1);
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background-color: var(--bg);
  background-image: radial-gradient(rgba(32, 196, 168, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
  position: relative;
}

.section:nth-child(even) {
  background: var(--bg-alt);
}

/* ============ 导航 ============ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 249, 242, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 107, 74, 0.08);
  box-shadow: 0 4px 24px rgba(58, 46, 57, 0.03);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: -0.4px;
  transition: var(--transition);
}

.logo:hover {
  transform: scale(1.02);
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  background: linear-gradient(135deg, var(--primary), var(--tertiary));
  color: #fff;
  box-shadow: 0 4px 14px rgba(255, 107, 74, 0.35);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.main-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink);
  transition: color 0.2s;
  position: relative;
  padding: 4px 0;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--tertiary));
  transition: width 0.3s ease;
  border-radius: 2px;
}

.main-nav a:hover {
  color: var(--primary);
}

.main-nav a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 10px 26px;
  border-radius: 999px;
  color: #fff !important;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  box-shadow: 0 4px 18px rgba(255, 107, 74, 0.3);
  transition: var(--transition) !important;
}

.nav-cta::after {
  display: none !important;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(255, 107, 74, 0.4);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: 12px;
  transition: var(--transition);
}

.menu-toggle:hover {
  background: rgba(255, 107, 74, 0.06);
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 4px;
  transition: 0.3s;
}

/* ============ Hero ============ */

.hero {
  min-height: 82vh;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 48px;
  padding: 140px 0 80px;
  position: relative;
  background:
    radial-gradient(ellipse at 85% 20%, rgba(255, 197, 61, 0.22) 0%, transparent 50%),
    radial-gradient(ellipse at 8% 88%, rgba(32, 196, 168, 0.14) 0%, transparent 42%),
    radial-gradient(ellipse at 50% 50%, rgba(255, 107, 74, 0.04) 0%, transparent 70%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(255, 197, 61, 0.12);
  filter: blur(30px);
  pointer-events: none;
}

.hero-content {
  flex: 1 1 440px;
  max-width: 680px;
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 6px 18px;
  border-radius: 999px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, rgba(32, 196, 168, 0.15), rgba(32, 196, 168, 0.08));
  color: var(--accent);
  border: 1px solid rgba(32, 196, 168, 0.2);
}

.hero-eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--tertiary);
  box-shadow: 0 0 0 4px rgba(255, 197, 61, 0.25);
}

.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  line-height: 1.15;
  margin-bottom: 22px;
  font-weight: 900;
  letter-spacing: -1px;
  background: linear-gradient(135deg, var(--primary) 20%, var(--tertiary) 70%, var(--accent) 110%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.12rem;
  line-height: 1.75;
  color: var(--muted);
  max-width: 520px;
  margin-bottom: 34px;
}

.hero-buttons {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-image {
  flex: 1 1 340px;
  min-width: 280px;
  border-radius: 28px;
  overflow: hidden;
  position: relative;
  box-shadow: 0 24px 80px rgba(255, 107, 74, 0.12);
  transform: rotate(2deg);
  transition: transform 0.6s cubic-bezier(0.21, 1.02, 0.73, 1);
}

.hero-image:hover {
  transform: rotate(0deg) translateY(-4px);
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
}

.hero-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 107, 74, 0.06), transparent 60%);
  pointer-events: none;
}

/* ============ 按钮 ============ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  box-shadow: 0 6px 22px rgba(255, 107, 74, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 12px 32px rgba(255, 107, 74, 0.45);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent);
}

.btn-outline:hover {
  background: rgba(32, 196, 168, 0.08);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(32, 196, 168, 0.15);
}

/* ============ 板块标签与标题 ============ */

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 14px;
  color: var(--primary);
}

.section-label::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(32, 196, 168, 0.18);
}

.section-title {
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  font-weight: 900;
  letter-spacing: -0.5px;
  line-height: 1.25;
  margin-bottom: 14px;
  color: var(--ink);
}

.section-desc {
  max-width: 600px;
  opacity: 0.7;
  line-height: 1.8;
  margin-bottom: 44px;
  color: var(--ink);
  font-size: 1.02rem;
}

/* ============ 卡片网格 ============ */

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.category-card {
  border-radius: var(--radius-md);
  padding: 32px 28px;
  background: #fff;
  border: 1px solid rgba(255, 107, 74, 0.06);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--tertiary), var(--accent));
  opacity: 0;
  transition: opacity 0.35s;
}

.category-card:hover {
  transform: translateY(-6px) rotate(-0.8deg);
  box-shadow: 0 16px 40px rgba(255, 107, 74, 0.12);
}

.category-card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  font-size: 1.4rem;
  background: linear-gradient(135deg, rgba(255, 197, 61, 0.2), rgba(255, 107, 74, 0.12));
  transition: var(--transition);
}

.category-card:hover .card-icon {
  transform: scale(1.08) rotate(-4deg);
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--primary);
  text-decoration: none;
  margin-top: 12px;
  transition: gap 0.25s;
}

.card-link:hover {
  gap: 12px;
}

/* ============ 特性块 ============ */

.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.feature-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  box-shadow: 0 20px 60px rgba(58, 46, 57, 0.09);
}

.feature-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s ease;
}

.feature-image:hover img {
  transform: scale(1.03);
}

.feature-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(32, 196, 168, 0.08), transparent);
  pointer-events: none;
}

.feature-text {
  position: relative;
}

.feature-list {
  list-style: none;
  margin-top: 16px;
}

.feature-list li {
  padding: 10px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink);
}

.feature-list li::before {
  content: '✓';
  font-weight: 900;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), #2ed8b6);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  box-shadow: 0 4px 12px rgba(32, 196, 168, 0.3);
  flex-shrink: 0;
}

/* ============ 数据条 ============ */

.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 36px 24px;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid rgba(32, 196, 168, 0.08);
  box-shadow: 0 6px 24px rgba(32, 196, 168, 0.07);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 40px rgba(32, 196, 168, 0.14);
}

.stat-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 3px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--primary), var(--tertiary));
  opacity: 0;
  transition: opacity 0.3s, width 0.3s;
}

.stat-item:hover::after {
  opacity: 1;
  width: 70px;
}

.stat-number {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -1px;
  background: linear-gradient(135deg, var(--primary), var(--tertiary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.92rem;
  color: var(--muted);
  margin-top: 10px;
  font-weight: 500;
}

/* ============ 内容墙 ============ */

.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.content-wall-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #fff;
  border: 1px solid rgba(255, 107, 74, 0.05);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.content-wall-item:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 16px 44px rgba(255, 107, 74, 0.12);
}

.content-wall-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.content-wall-item:hover img {
  transform: scale(1.06);
}

.content-wall-body {
  padding: 22px 24px 26px;
}

/* ============ FAQ ============ */

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid rgba(58, 46, 57, 0.06);
  border-radius: 18px;
  margin-bottom: 12px;
  overflow: hidden;
  cursor: pointer;
  background: #fff;
  transition: var(--transition);
  box-shadow: 0 2px 10px rgba(58, 46, 57, 0.03);
}

.faq-item:hover {
  border-color: rgba(255, 107, 74, 0.25);
  box-shadow: 0 6px 20px rgba(255, 107, 74, 0.08);
}

.faq-item .faq-question {
  padding: 20px 24px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  color: var(--ink);
  transition: color 0.2s;
}

.faq-item:hover .faq-question {
  color: var(--primary);
}

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.6rem;
  font-weight: 300;
  line-height: 1;
  color: var(--primary);
  transition: transform 0.35s ease;
  flex-shrink: 0;
}

.faq-item.open .faq-question::after {
  transform: rotate(45deg);
}

.faq-item .faq-answer {
  padding: 0 24px 20px;
  display: none;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.75;
}

.faq-item.open .faq-answer {
  display: block;
  animation: fadeSlide 0.3s ease;
}

@keyframes fadeSlide {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============ CTA横幅 ============ */

.cta-banner {
  padding: 64px 48px;
  text-align: center;
  border-radius: 32px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 45%, var(--tertiary) 100%);
  box-shadow: 0 20px 70px rgba(255, 107, 74, 0.35);
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -40px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.14);
}

.cta-banner::after {
  content: '';
  position: absolute;
  bottom: -60px;
  left: -20px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.09);
}

.cta-banner h2 {
  color: #fff;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 900;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
  letter-spacing: -0.5px;
}

.cta-banner p {
  position: relative;
  z-index: 1;
  font-size: 1.08rem;
  opacity: 0.92;
  margin-bottom: 28px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-banner .btn-primary {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 8px 26px rgba(58, 46, 57, 0.18);
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 14px 36px rgba(58, 46, 57, 0.25);
}

/* ============ 页脚 ============ */

.site-footer {
  padding: 64px 0 28px;
  background: linear-gradient(180deg, var(--bg), #FDF2E7);
  border-top: 2px solid rgba(255, 107, 74, 0.08);
  position: relative;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}

.footer-brand p {
  font-size: 0.95rem;
  color: var(--muted);
  margin-top: 16px;
  max-width: 280px;
  line-height: 1.8;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--ink);
  position: relative;
  padding-bottom: 8px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--tertiary));
  border-radius: 2px;
}

.footer-col a {
  display: block;
  font-size: 0.9rem;
  color: var(--muted);
  text-decoration: none;
  padding: 5px 0;
  transition: color 0.2s, padding-left 0.2s;
}

.footer-col a:hover {
  color: var(--primary);
  padding-left: 6px;
}

.footer-bottom {
  border-top: 1px solid rgba(58, 46, 57, 0.08);
  margin-top: 48px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ============ 工具类 ============ */

.text-accent {
  color: var(--primary);
  font-weight: 800;
}

.text-center {
  text-align: center;
}

.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  color: var(--muted);
  line-height: 1.8;
  text-align: center;
}

.mt-0 {
  margin-top: 0;
}

.mb-0 {
  margin-bottom: 0;
}

/* ============ 响应式 ============ */

@media (max-width: 900px) {
  .feature-block {
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .hero {
    padding-top: 120px;
  }

  .feature-block {
    grid-template-columns: 1fr;
  }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .main-nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: rgba(255, 249, 242, 0.98);
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid rgba(255, 107, 74, 0.1);
    box-shadow: 0 16px 40px rgba(58, 46, 57, 0.08);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
  }

  .main-nav.open a {
    display: block;
    padding: 12px 16px;
    border-radius: 14px;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.7);
  }

  .main-nav.open a:hover {
    background: rgba(255, 107, 74, 0.08);
    color: var(--primary);
  }

  .main-nav.open .nav-cta {
    display: block;
    text-align: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
  }

  .cta-banner {
    padding: 48px 28px;
    border-radius: 24px;
  }
}

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-buttons .btn {
    justify-content: center;
    width: 100%;
  }

  .section {
    padding: 64px 0;
  }

  .hero {
    padding-top: 110px;
  }

  .cta-banner {
    padding: 40px 24px;
  }
}